Tony Hwang wrote:
Hi,
My question is how come it matted down? Moisture problem one time or
another? I want to make sure about this. Is there vapor barrier under
neath?
If all is good, I'd just add more insulation by any means. Here it is
R60 in the attic.

My guess would be that it started as no more than R-11 insulation, so it really
didn't matt down all that much.